<template>
	<div>
		<!-- 面包屑导航区 -->
		<el-breadcrumb separator-class="el-icon-arrow-right">
			<el-breadcrumb-item :to="{ path: '/home' }"
				>首页</el-breadcrumb-item
			>
			<el-breadcrumb-item>商品管理</el-breadcrumb-item>
			<el-breadcrumb-item>添加商品</el-breadcrumb-item>
		</el-breadcrumb>

		<!-- 卡片视图 -->
		<el-card>
			<el-alert
				title="添加商品信息"
				type="info"
				center
				show-icon
				:closable="false"
			>
			</el-alert>
			<!-- 步骤条区域 -->
			<el-steps
				:space="200"
				:active="activeIndex - 0"
				finish-status="success"
				align-center
			>
				<el-step title="基本信息"></el-step>
				<el-step title="商品参数"></el-step>
				<el-step title="商品属性"></el-step>
				<el-step title="商品图片"></el-step>
				<el-step title="商品内容"></el-step>
				<el-step title="完成"></el-step>
			</el-steps>

			<!-- tab栏区域 -->
			<el-form
				:model="addForm"
				:rules="addFormRules"
				ref="addFormRef"
				label-width="100px"
				label-position="top"
			>
				<el-tabs
					v-model="activeIndex"
					:tab-position="'left'"
					:before-leave="beforeTabLeave"
					@tab-click="tabClicked"
				>
					<el-tab-pane label="基本信息" name="0">
						<el-form-item label="商品名称" prop="goods_name">
							<el-input v-model="addForm.goods_name"></el-input>
						</el-form-item>
						<el-form-item label="商品价格" prop="goods_price">
							<el-input
								v-model="addForm.goods_price"
								type="number"
							></el-input>
						</el-form-item>
						<el-form-item label="商品重量" prop="goods_weight">
							<el-input
								v-model="addForm.goods_weight"
								type="number"
							></el-input>
						</el-form-item>
						<el-form-item label="商品数量" prop="goods_number">
							<el-input
								v-model="addForm.goods_number"
								type="number"
							></el-input>
						</el-form-item>

						<el-form-item label="商品分类" prop="goods_cat">
							<el-cascader
								expand-trigger="hover"
								:options="catelist"
								:props="cateProps"
								v-model="addForm.goods_cat"
								@change="handleChange"
							>
							</el-cascader>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品参数" name="1">
						<!-- 渲染表单的 Item 项 -->
						<el-form-item
							:label="item.attr_name"
							v-for="item in manyTableData"
							:key="item.attr_id"
						>
							<!-- 复选框组 -->
							<el-checkbox-group v-model="item.attr_vals">
								<el-checkbox
									:label="cb"
									v-for="(cb, i) in item.attr_vals"
									:key="i"
									border
								></el-checkbox>
							</el-checkbox-group>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品属性" name="2">
						<el-form-item
							:label="item.attr_name"
							v-for="item in onlyTableData"
							:key="item.attr_id"
						>
							<el-input v-model="item.attr_vals"></el-input>
						</el-form-item>
					</el-tab-pane>
					<el-tab-pane label="商品图片" name="3">
						<!-- action 表示图片要上传到的后台 API 地址 -->
						<el-upload
							:action="uploadURL"
							:on-preview="handlePreview"
							:on-remove="handleRemove"
							list-type="picture"
							:headers="headerObj"
							:on-success="handleSuccess"
						>
							<el-button size="small" type="primary"
								>点击上传</el-button
							>
						</el-upload>
					</el-tab-pane>
					<el-tab-pane label="商品内容" name="4">
						<!-- 富文本编辑器组件 -->
						<quill-editor
							v-model="addForm.goods_introduce"
						></quill-editor>
						<!-- 添加商品的按钮 -->
						<el-button @click="add" type="primary" class="btnAdd"
							>添加商品</el-button
						>
					</el-tab-pane>
				</el-tabs>
			</el-form>
		</el-card>

		<!-- 图片预览 -->
		<el-dialog title="图片预览" :visible.sync="previewVisible" width="50%">
			<img :src="previewPath" alt="" class="previewImg" />
		</el-dialog>
	</div>
</template>

<script>
import _ from 'lodash';

export default {
	data() {
		return {
			activeIndex: '0',
			// 添加商品的表单数据对象
			addForm: {
				goods_name: '',
				goods_price: 0,
				goods_weight: 0,
				goods_number: 0,
				// 商品所属的分类数组
				goods_cat: [],
				// 图片的数组
				pics: [],
				// 商品的详情描述
				goods_introduce: '',
				attrs: [],
			},
			addFormRules: {
				goods_name: [
					{
						required: true,
						message: '请输入商品名称',
						trigger: 'blur',
					},
				],
				goods_price: [
					{
						required: true,
						message: '请输入商品价格',
						trigger: 'blur',
					},
				],
				goods_weight: [
					{
						required: true,
						message: '请输入商品重量',
						trigger: 'blur',
					},
				],
				goods_number: [
					{
						required: true,
						message: '请输入商品数量',
						trigger: 'blur',
					},
				],
				goods_cat: [
					{
						required: true,
						message: '请选择商品分类',
						trigger: 'blur',
					},
				],
			},
			// 商品分类列表
			catelist: [],
			cateProps: {
				label: 'cat_name',
				value: 'cat_id',
				children: 'children',
			},
			// 动态参数列表数据
			manyTableData: [],
			// 静态属性列表数据
			onlyTableData: [],
			// 上传图片的URL地址
			uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
			// 图片上传组件 headers 请求头对象
			headerObj: {
				Authorization: window.sessionStorage.getItem('token'),
			},
			previewPath: '',
			previewVisible: false,
		};
	},
	created() {
		this.getCateList();
	},
	methods: {
		// 获取所有商品分类数据
		async getCateList() {
			const { data: res } = await this.$http.get('categories');

			if (res.meta.status !== 200) {
				return this.$message.error('获取商品分类数据失败');
			}

			this.catelist = res.data;

			console.log(this.catelist);
		},
		// 级联选择器选中项变化, 会触发这个函数
		handleChange() {
			console.log(this.addForm.goods_cat);

			if (this.addForm.goods_cat.length !== 3) {
				this.addForm.goods_cat = [];
			}
		},
		beforeTabLeave(activeName, oldActiveName) {
			// console.log('即将离开的标签页名字是: '+ oldActiveName);
			// console.log('即将进入的标签页名字是: '+ activeName);

			// return false

			if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
				this.$message.error('请先选择商品分类');
				return false;
			}
		},
		async tabClicked() {
			// console.log(this.activeIndex);
			// 证明访问的是动态参数面板
			if (this.activeIndex === '1') {
				const { data: res } = await this.$http.get(
					`categories/${this.cateId}/attributes`,
					{
						params: {
							sel: 'many',
						},
					}
				);
				if (res.meta.status !== 200) {
					return this.$message.error('获取动态参数列表失败');
				}

				console.log(res.data);
				res.data.forEach((item) => {
					item.attr_vals =
						item.attr_vals.length === 0
							? []
							: item.attr_vals.split(' ');
				});
				this.manyTableData = res.data;
			} else if (this.activeIndex === '2') {
				const { data: res } = await this.$http.get(
					`categories/${this.cateId}/attributes`,
					{
						params: {
							sel: 'only',
						},
					}
				);

				if (res.meta.status !== 200) {
					return this.$message.error('获取静态属性失败');
				}

				console.log(res.data);
				this.onlyTableData = res.data;
			}
		},
		// 处理图片预览效果
		handlePreview(file) {
			console.log(file);
			this.previewPath = file.response.data.url;
			this.previewVisible = true;
		},
		// 处理移除图片的操作
		handleRemove(file) {
			// console.log(file);
			// 1.获取将要删除的图片的临时路径
			const filePath = file.response.data.tmp_path;
			// 2.从 pics 数组中, 找到这个图片对应的索引值
			const i = this.addForm.pics.findIndex((x) => x.pic === filePath);
			// 3.调用数组的 splice 方法, 把图片信息对象, 从 pics 数组中移除
			this.addForm.pics.splice(i, 1);
			console.log(this.addForm);
		},
		// 监听图片上传成功的事件
		handleSuccess(response) {
			console.log(response);
			// 1.拼接得到一个图片信息对象
			const picInfo = { pic: response.data.tmp_path };
			// 2.将图片信息对象, push 到 pics 数组中
			this.addForm.pics.push(picInfo);
			console.log(this.addForm);
		},
		// 添加商品
		add() {
			this.$refs.addFormRef.validate(async (valid) => {
				if (!valid) {
					return this.$message.error('请填写必要的表单项目');
				}

				// 执行添加的业务逻辑
				// lodash   cloneDeep(obj)
				const form = _.cloneDeep(this.addForm);
				form.goods_cat = form.goods_cat.join(',');
				// 处理动态参数
				this.manyTableData.forEach((item) => {
					const newInfo = {
						attr_id: item.attr_id,
						attr_value: item.attr_vals.join(' '),
					};
					this.addForm.attrs.push(newInfo);
				});
				// 处理静态属性
				this.onlyTableData.forEach((item) => {
					const newInfo = {
						attr_id: item.attr_id,
						attr_value: item.attr_vals,
					};
					this.addForm.attrs.push(newInfo);
				});
				form.attrs = this.addForm.attrs;
				console.log(form);

				// 发起请求添加商品
				// 商品的名称, 必须是唯一的
				const { data: res } = await this.$http.post('goods', form);

				if (res.meta.status !== 201) {
					return this.$message.error('添加商品失败');
				}

				this.$message.success('添加商品成功');
				this.$router.push('/goods');
			});
		},
	},
	computed: {
		cateId() {
			if (this.addForm.goods_cat.length === 3) {
				return this.addForm.goods_cat[2];
			}
			return null;
		},
	},
};
</script>

<style lang="scss" scoped>
.el-checkbox {
	margin: 0 10px 0 0 !important;
}

.previewImg {
	widows: 100%;
}
.btnAdd {
	margin-top: 15px;
}
</style>
